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← Return to CGM vs Finger Stick
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I also was told by the Dexcom people during a tech support session that Dexcom has issues with accuracy over 300 and under 40. They started quoting the acceptable differences for various ranges and I have forgotten the details. I think the bottom line is that “when in doubt use a finger stick” I had an endocrinology follow up appointment recently and my provider complimented me on doing this. Do you all continue to double check with meters?
Replies to "I also was told by the Dexcom people during a tech support session that Dexcom has..."
I double-check with a finger stick if my BG reading from my Libre3+ is too high or too low. But you have to remember the sensor is reading interstitial fluid, not your actual blood. This is going to make a time difference which you should take into consideration. I love my sensor and take it for what it says most of the time. Libre also recommends checking with a finger stick for the first few days after applying a new sensor, but I don't always do that. I think it's like a "back-up". Libre also recommends placing the sensor on the back side of your arm. I do that because they did the scientific work, not me!! Some people put them other places on their body but I am happy (at least on this subject!) following their rules.
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I do double check my Dexcom G7 several times during the first day or two of a new session and on occasion during the 10 day cycle. One thing that I have learned is that if you are off by too much - don't try to calibrate the difference all at once. I usually halve the difference over a few hours and that seems to help dial it in without errors.